4. fabric2.2 create and join channels (use the official demo)

We will build it step by step Fabric2.2 Version of blockchain network , from 0 Start setting up the server environment 、 To the operation official Demo colony 、 Create channels 、 Installation contract , And complete the development of agricultural product traceability project based on blockchain from zero . It is applicable to friends without blockchain development experience , If you have experience, please detour .

Follow the author , Do not omit every operation step . The blockchain cluster has been successfully deployed in the previous section , And analyze the startup script , In this section, learn how to create and join channels .

1. View the current cluster status docker ps
   
   fabric demo Default one orderer、 Two organizations 、 One node per organization , Currently, the cluster has only system channels , There are no other application channels .

2. Channel concept
   The channel is used to realize the isolation of services in the blockchain network , One alliance has multiple channels , Each channel can represent a service , And corresponding to a set of account books , The members in the channel are business participants （ That is, the organizations in the Alliance ）, An organization can join multiple channels .

3. Create and join channels
   Get into /root/fabric/scripts/fabric-samples/test-network Catalog , perform ./network.sh createChannel command , Show successful execution , Finish creating channels and adding nodes to channels .